Determine whether the following series are convergent or divergent. In case of a convergent series, find its sum.\\ (a) $\sum_{n=1}^{\infty} \frac{12 \cdot 2^{n+1}}{3^n}$;\\ (b) $\sum_{n=1}^{\infty} (\frac{4}{7n} + \frac{3}{n})$.
Added by Soledad G.
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Step 1: Part (a): write the general term and simplify: 12 * 2^{n+1} / 3^n = 12 * 2 * 2^n / 3^n = 24 * (2/3)^n. Show more…
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